结构及尺寸  该阀由阀体、阀瓣、弹簧等组成，水平或垂直安装于管路系统，防止介质倒流，具有结构短、体积小、质量轻；阀瓣关闭快速，水锤压力小；流道通畅，流体阻力小；动作灵敏，密封性能好。 主要技术参数 型号公称压力试验压力工作温度适用温度壳体密封H71H-16Q1.62.41.76≤235℃水、蒸气、油品等H71H-25Q2.53.752.75≤235℃H71W-25H≤300℃H71W-25P≤200℃硝酸等腐蚀性介质H71W-40H4.06.04.4≤300℃H71W-40P≤200℃水、蒸气主要零件材料型号阀门阀瓣弹簧H71H-16Q  H71H-25QQT400-152550CrVAH71W-25H  H71W-40H2Cr131Cr131Cr18Ni9H71W-25P  H71W-40PZG1Cr18Ni9Ti1Cr18Ni9Ti1Cr18Ni9Ti主要外形尺寸公称通径LD公称通径LD1.62.54.01.62.54.0152548484880711401401402031.5585858100801601651652535.568686812511019019519532408080870150125215225225404590909020016027028539050561051051052502003303403506563125125125300250385400415